s390x/tcg: Refactor SET FPC AND SIGNAL handling
We can directly work on the uint64_t value, no need for a temporary uint32_t value. Also cleanup and shorten the comments. Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: David Hildenbrand <david@redhat.com> Message-Id: <20190218122710.23639-7-david@redhat.com> Signed-off-by: Cornelia Huck <cohuck@redhat.com>
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@ -771,21 +771,23 @@ void HELPER(sfpc)(CPUS390XState *env, uint64_t fpc)
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}
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/* set fpc and signal */
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void HELPER(sfas)(CPUS390XState *env, uint64_t val)
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void HELPER(sfas)(CPUS390XState *env, uint64_t fpc)
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{
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uint32_t signalling = env->fpc;
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uint32_t source = val;
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uint32_t s390_exc;
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/* The contents of the source operand are placed in the FPC register;
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then the flags in the FPC register are set to the logical OR of the
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signalling flags and the source flags. */
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env->fpc = source | (signalling & 0x00ff0000);
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set_float_rounding_mode(fpc_to_rnd[source & 3], &env->fpu_status);
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/*
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* FPC is set to the FPC operand with a bitwise OR of the signalling
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* flags.
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*/
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env->fpc = fpc | (signalling & 0x00ff0000);
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set_float_rounding_mode(fpc_to_rnd[fpc & 3], &env->fpu_status);
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/* If any signalling flag is 1 and the corresponding source mask
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is also 1, a simulated-iee-exception trap occurs. */
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s390_exc = (signalling >> 16) & (source >> 24);
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/*
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* If any signaling flag is enabled in the new FPC mask, a
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* simulated-iee-exception exception occurs.
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*/
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s390_exc = (signalling >> 16) & (fpc >> 24);
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if (s390_exc) {
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tcg_s390_data_exception(env, s390_exc | 3, GETPC());
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}
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